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418991 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL, outside_diameter: 32.0 MILLIMETERS NOMINAL MM, style_designator: CIRCULAR, aperture_diameter: 7.0 MILLIMETERS NOMINAL MM, overall_thickness: 13.8 MILLIMETERS NOMINAL MM, part_name_assigned_by_controlling_agency: SHIM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-040-2484, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
418991
NSN: 4730-00-040-2484
FSC: 4730
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
materialSTEEL
outside_diameter32.0 MILLIMETERS NOMINAL MM
style_designatorCIRCULAR
aperture_diameter7.0 MILLIMETERS NOMINAL MM
overall_thickness13.8 MILLIMETERS NOMINAL MM
part_name_assigned_by_controlling_agencySHIM
NSN4730-00-040-2484
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 418991 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CONNECTION STYLE: FLARED (TUBE) FIRST END
•
SEAT ANGLE: 37.0 DEGREES FIRST END
•
NOMINAL THREAD SIZE: 0.812 INCHES SECOND END IN
•
THREAD QUANTITY PER INCH: 18 FIRST END
•
THREAD SERIES DESIGNATOR: UNEF SECOND END
•
NOMINAL OVERALL LENGTH: 2.000 INCHES IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION STYLEFLARED (TUBE) FIRST END
SEAT ANGLE37.0 DEGREES FIRST END
NOMINAL THREAD SIZE0.812 INCHES SECOND END IN
THREAD QUANTITY PER INCH18 FIRST END
THREAD SERIES DESIGNATORUNEF SECOND END
NOMINAL OVERALL LENGTH2.000 INCHES IN
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORUNS FIRST END
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.625 INCHES FIRST END IN
NOMINAL THREAD SIZE0.875 INCHES FIRST END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
PPP-T-45Interchangeable
interchangeable cross-reference
interchangeable
A-A-1492Interchangeable
interchangeable cross-reference
interchangeable
806719Interchangeable
interchangeable cross-reference
interchangeable
418991Interchangeable
interchangeable cross-reference
interchangeable
418990-DInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 418991?
418991 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 418991?
There are 5 known substitutes for 418991: PPP-T-45, A-A-1492, 806719 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 418991?
418991 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-040-2484. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026